In windows x64 platform, which jdk is recommend to install? [duplicate]

This question already has answers here: 开发者_运维百科 Closed 11 years ago.

Possible Duplicate:

Do i have to install jdk win64?

JDK for windows or JDK for windows x64, why?

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Unless you need to use tons of memory in your Java application or need to access native code, it doesn't really matter too much which one to use.

To summarize:

Reasons to use x64 JDK:

• Need to use a lot of memory in your apps (> 2GB)
• Need to use native code from x64 DLLs

Reasons to use x32 JDK:

• Need to use native code from x32 DLLs.

The .class files and .jar files produced will be completely identical, so you don't need to develop on the same system than what you deploy to.

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If you do alot of 64-bit calculations you may find that the 64-bit version is faster. If you don't you might find that the 32-bit version is faster. It can make as much as 10% difference either way.

If you want to use more than 1.2 GB of memory, you may need the 64-bit version.

One reason people tend to use the 32-bit version is the belief that this reduces memory consumption. The difference is minor and the 64-bit version has an option to use 32-bit addresses -XX:+UseCompressedOops which allows you to use 32-bit address and access 32 Gb of memory.

In summary, I would just use the 64-bit version and if the memory consumption worries you, use the extra options.